SIGNAL PROCESSING DEVICE

摘要

A level shifter converting a binary signal having a first potential and a second potential into a signal having the first potential and a third potential, and a signal processing circuit using the level shifter are provided. The first potential is higher than the second potential. The second potential is higher than the third potential. The potential difference between the first potential and the third potential may be more than or equal to 3 V and less than 4 V. The level shifter includes a current control circuit which generates a second signal for operating an amplifier circuit for a certain period in accordance with the potential change of the first signal which is input to the amplifier circuit. The output of level shifter is input to a gate of an N-channel transistor whose threshold voltage is lower than 0 V.

主权项

1. A signal processing device comprising:
a first circuit electrically connected to a first power supply line having a first potential, wherein a first signal is input to the first circuit, and wherein a second signal is output from the first circuit; a switch electrically connected to the first circuit and a second power supply line having a second potential; and a second circuit electrically connected to the first power supply line and the second power supply line, the second circuit being configured to generate a third signal for controlling the switch, wherein an amplitude of the second signal is larger than an amplitude of the first signal.